Höskuldur Thráinsson. 2017. U-umlaut in Icelandic and Faroese: Survival and death. In Claire Bowern, Laurence Horn & Raffaella Zanuttini (eds.), On looking into words (and beyond), 99–113. Berlin: Language Science Press. http://langsci-press.org/catalog/view/151/622/683-2 (页面存档备份,存于互联网档案馆)
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Höskuldur Thráinsson. 2017. U-umlaut in Icelandic and Faroese: Survival and death. In Claire Bowern, Laurence Horn & Raffaella Zanuttini (eds.), On looking into words (and beyond), 99–113. Berlin: Language Science Press. http://langsci-press.org/catalog/view/151/622/683-2 (页面存档备份,存于互联网档案馆)